//go:build windows

package backup

import (
	"errors"
	"os"
	"path/filepath"
	"testing"

	"github.com/aritmolab/thothii/tools/tht/internal/safeio"
)

func TestReplaceRestoreFileWindowsCreatesAndReplacesOwnerOnlyRegular(t *testing.T) {
	parent := filepath.Join(t.TempDir(), "private")
	if err := os.Mkdir(parent, 0o700); err != nil {
		t.Fatal(err)
	}
	if err := safeio.ProtectPrivateDirectory(parent); err != nil {
		t.Fatal(err)
	}
	target := filepath.Join(parent, "auth.yaml")
	if err := replaceRestoreFile(target, []byte("created"), 0o600); err != nil {
		t.Fatal(err)
	}
	if err := safeio.ValidatePrivateRegular(target); err != nil {
		t.Fatalf("created restore file is not owner-only: %v", err)
	}
	if err := replaceRestoreFile(target, []byte("replacement"), 0o600); err != nil {
		t.Fatal(err)
	}
	if err := safeio.ValidatePrivateRegular(target); err != nil {
		t.Fatalf("replacement restore file is not owner-only: %v", err)
	}
	contents, err := os.ReadFile(target)
	if err != nil || string(contents) != "replacement" {
		t.Fatalf("replacement contents = %q, error = %v", contents, err)
	}
}

func TestReplaceRestoreFileWindowsPinsParentAndRejectsReparsePath(t *testing.T) {
	root := t.TempDir()
	parent := filepath.Join(root, "private")
	if err := os.Mkdir(parent, 0o700); err != nil {
		t.Fatal(err)
	}
	if err := safeio.ProtectPrivateDirectory(parent); err != nil {
		t.Fatal(err)
	}
	target := filepath.Join(parent, "users.yaml")
	if err := os.WriteFile(target, []byte("old"), 0o600); err != nil {
		t.Fatal(err)
	}
	if err := safeio.ProtectPrivateRegular(target); err != nil {
		t.Fatal(err)
	}
	renamed := parent + "-renamed"
	var hookCalled bool
	restoreHook := safeio.SetPrivateDirectoryTestHookForTest(func(stage string) {
		if stage != "after-restore-parent-open" {
			return
		}
		hookCalled = true
		if err := os.Rename(parent, renamed); err == nil {
			t.Fatal("parent rename succeeded while restore retained its directory handles")
		}
	})
	defer restoreHook()
	if err := replaceRestoreFile(target, []byte("new"), 0o600); err != nil {
		t.Fatal(err)
	}
	if !hookCalled {
		t.Fatal("parent-pinning race hook was not reached")
	}

	link := filepath.Join(root, "reparse-parent")
	if err := os.Symlink(parent, link); err != nil {
		t.Skipf("Windows host does not permit symlink creation: %v", err)
	}
	if err := replaceRestoreFile(filepath.Join(link, "users.yaml"), []byte("unsafe"), 0o600); !errors.Is(err, safeio.ErrUnsafeFile) {
		t.Fatalf("reparse-parent restore error = %v, want ErrUnsafeFile", err)
	}
}